Missing Chickens (Fox?)

Okay, we have lost at least five chickens in the last two weeks, one to Mereks and the others to disappearance. We had not found any feathers until about five minutes ago, when my dad was doing some yard work. I believe it was a fox, because there is no blood, just a bunch of feathers. And it is in a wooded aria, so hawks are out of the question. We did witness our rooster chasing one of the hens earlier (not the one that got got) Is it possible that hes gone psycho? Please help

It's doubtful that it's your rooster. If he was killing your hens, there would have been some sign of them. (He was probably chasing the hen trying to get her to submit to mating.) Do you have a secure run to lock them in? As long as they're accessible to whatever is getting them, it will keep coming back until it has wiped out your flock.